<style>
    *{
      margin: 0;padding: 0;
    }
    .page{
      height: 200px;
    }
    .left, .right{
      height: 200px;
      width: 200px;
      background-color: aquamarine;
    }
    .page > div{
      float: left;
    }
    .content{
      height: 200px;
      background-color: #eb6238;
      width: 100%;
    }
    .inner{
      margin: 0 200px;
      height: 100%;
    }
    .left{
      margin-left: -100%;
    }
    .right{
      margin-left: -200px;
    }

    .ccc {
      margin-left: 30px;
      width: 70px;
  height: 100px;
  background-color: red;
  transform: skew(20deg);
  
 }
  </style>
</head>
<body>
  <div class="page">
    <div class="content">
      <div class="inner">主体内容</div>
    </div>
    <div class="left">广告位</div>
    <div class="right">广告位</div>
  </div>

  <div class="ccc"></div>
</body>
